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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac7c028dea0e213f0870b8f0fa716e175c2c4c8f955aba9415c02327d145996' 
  AND token = 'xaF8ssoJoN/YIAAHA7Z4ziZPyAiFpohI6stohRTJ8C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}